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#include "Cache.h"
#include <dirent.h>
#include <openssl/evp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
static char cache_dir[512] = {0};
static int cache_ttl_search_val = 3600;
static int cache_ttl_infobox_val = 86400;
void set_cache_ttl_search(int ttl) { cache_ttl_search_val = ttl; }
void set_cache_ttl_infobox(int ttl) { cache_ttl_infobox_val = ttl; }
int get_cache_ttl_search(void) { return cache_ttl_search_val; }
int get_cache_ttl_infobox(void) { return cache_ttl_infobox_val; }
static void md5_hash(const char *str, char *output) {
unsigned char hash[EVP_MAX_MD_SIZE];
unsigned int hash_len;
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
if (!ctx)
return;
EVP_DigestInit_ex(ctx, EVP_md5(), NULL);
EVP_DigestUpdate(ctx, str, strlen(str));
EVP_DigestFinal_ex(ctx, hash, &hash_len);
EVP_MD_CTX_free(ctx);
for (unsigned int i = 0; i < hash_len; i++) {
sprintf(output + (i * 2), "%02x", hash[i]);
}
}
static time_t get_file_mtime(const char *filepath) {
struct stat st;
if (stat(filepath, &st) == 0) {
return st.st_mtime;
}
return 0;
}
int cache_init(const char *dir) {
if (!dir || strlen(dir) == 0) {
strcpy(cache_dir, "/tmp/omnisearch_cache");
} else {
strncpy(cache_dir, dir, sizeof(cache_dir) - 1);
cache_dir[sizeof(cache_dir) - 1] = '\0';
}
struct stat st;
if (stat(cache_dir, &st) != 0) {
if (mkdir(cache_dir, 0755) != 0) {
fprintf(stderr, "Failed to create cache directory: %s\n", cache_dir);
return -1;
}
} else if (!S_ISDIR(st.st_mode)) {
fprintf(stderr, "Cache path exists but is not a directory: %s\n",
cache_dir);
return -1;
}
char subdirs[] = "0123456789abcdef";
for (int i = 0; subdirs[i]; i++) {
char subdir_path[1024];
snprintf(subdir_path, sizeof(subdir_path), "%s/%c", cache_dir, subdirs[i]);
if (stat(subdir_path, &st) != 0) {
mkdir(subdir_path, 0755);
}
}
return 0;
}
void cache_shutdown(void) { cache_dir[0] = '\0'; }
char *cache_compute_key(const char *query, int page, const char *engine_name) {
char key_buffer[1024];
snprintf(key_buffer, sizeof(key_buffer), "%s_%d_%s", query ? query : "", page,
engine_name ? engine_name : "");
char *hash = malloc(33);
if (!hash) {
return NULL;
}
md5_hash(key_buffer, hash);
return hash;
}
int cache_get(const char *key, time_t max_age, char **out_data,
size_t *out_size) {
if (!key || !out_data || !out_size || cache_dir[0] == '\0') {
return -1;
}
char filepath[1024];
snprintf(filepath, sizeof(filepath), "%s/%c/%s.cache", cache_dir, key[0],
key);
time_t file_mtime = get_file_mtime(filepath);
if (file_mtime == 0) {
return -1;
}
time_t now = time(NULL);
if (max_age > 0 && (now - file_mtime) > max_age) {
remove(filepath);
return -1;
}
FILE *fp = fopen(filepath, "rb");
if (!fp) {
return -1;
}
fseek(fp, 0, SEEK_END);
long size = ftell(fp);
fseek(fp, 0, SEEK_SET);
if (size <= 0) {
fclose(fp);
return -1;
}
char *data = malloc(size + 1);
if (!data) {
fclose(fp);
return -1;
}
size_t read_size = fread(data, 1, size, fp);
fclose(fp);
if (read_size != (size_t)size) {
free(data);
return -1;
}
data[size] = '\0';
*out_data = data;
*out_size = size;
return 0;
}
int cache_set(const char *key, const char *data, size_t size) {
if (!key || !data || size == 0 || cache_dir[0] == '\0') {
return -1;
}
char filepath[1024];
snprintf(filepath, sizeof(filepath), "%s/%c/%s.cache", cache_dir, key[0],
key);
FILE *fp = fopen(filepath, "wb");
if (!fp) {
return -1;
}
size_t written = fwrite(data, 1, size, fp);
fclose(fp);
if (written != size) {
remove(filepath);
return -1;
}
return 0;
}
void cache_cleanup(time_t max_age) {
if (cache_dir[0] == '\0' || max_age <= 0) {
return;
}
time_t now = time(NULL);
time_t cutoff = now - max_age;
char subdirs[] = "0123456789abcdef";
for (int d = 0; subdirs[d]; d++) {
char subdir_path[1024];
snprintf(subdir_path, sizeof(subdir_path), "%s/%c", cache_dir, subdirs[d]);
DIR *dir = opendir(subdir_path);
if (!dir)
continue;
struct dirent *entry;
while ((entry = readdir(dir)) != NULL) {
size_t len = strlen(entry->d_name);
if (len > 7 && strcmp(entry->d_name + len - 7, ".cache") == 0) {
char filepath[2048];
snprintf(filepath, sizeof(filepath), "%s/%s", subdir_path,
entry->d_name);
struct stat st;
if (stat(filepath, &st) == 0 && st.st_mtime < cutoff) {
remove(filepath);
}
}
}
closedir(dir);
}
}
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